import React from 'react';
import ReactDOM from 'react-dom';
// import App from './day3/biao'

function tick(){
    const element=(
        <div>
            <h2>{new Date().toLocaleTimeString().slice(2)}</h2>
        </div>
    )
    ReactDOM.render(element,document.getElementById('root'))
};
setInterval(tick, 1000);

